My citron c5 2005 keeps dying.Message comes up saying depollution system fautly and engine mangment system faulty. Now it wont start and its saying eco mode active

You need an auto electrician to connect a pro grade scan tool computer and it will diagnose codes and communication errors that a cheap tool can't.

Peugeot depollution system error

https://www.google.com/search?q=depollution+sytem+faulty

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Question edited for clarity.
Question moved to the correct category.

Depollution Fault

https://www.google.com/search?q=2008+Peugeot+308+1.6VTI%2C+Depollution+System+Fault

Take it out for a good long thrash down the motorway.
https://www.justanswer.com/peugeot/5crow-peugeot-does-mean.html


Code P1338
https://www.google.com/search?q=peugeot+308+p1338+fault+code

Code P011
https://www.google.com/search?q=peugeot+308+p0011+fault+code&

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It means that you must have the engine control module (known as the PCM) scanned for fault codes, this light can be turned on by literally hundreds of different faults.

I am guessing but it could be the particulate filter is sufficiently blocked to cause exhaust back pressure to become excessive.

If this is the case the car will need the solvent reservoir topping up and diagnostic equipment using to initiate a cleaning cycle.

What is a 55 plate?

These motors and some other models with the same system always give problems .Havent done one myself as yet but other mechanics have that i talk too and if this is a diesel which has this system then you remove the particle filter on the exhaust system and make a rear box to fit type job and the sensor you disconnect and solder a resistor of around the 10.000 ohm mark across the sesnor wires to make the computer think all is well .Depends on the year though as to weither this will work satisfactory as a 53 plate sounds misteriously like some sort of secret code to me .Just noticed it says petrol 16v Hmm have to think again here as no idea with this one only ever see a diesel variant but if the cap fits so to speak have a look to see if has got a filtering out exhaust system if not then sell it quick and buy a ford or a VW

am facing the problem ,, and the turbo swich off sudannly,
plz advice

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Puegeot way of saying check engine light,you will need to pull a diagnostic code

depollution system means emmision control unit which means lambda sensor + computer and catalytic convertor...
have the lambda sensor/oxygen sensor replaced.

It sounds like your iginition switch is faulty. Could be time for a new switch